[PATCH] cpufreq: qcom-cpufreq-hw: Fix uninitialized throttled_freq warning

[PATCH] cpufreq: qcom-cpufreq-hw: Fix uninitialized throttled_freq warning

[Viresh Kumar]

Commit 6240aaad75e1 was supposed to drop the reference count to the OPP,
instead it avoided more stuff if the OPP isn't found. This isn't
entirely correct. We already have a frequency value available, we just
couldn't align it with an OPP in case of IS_ERR(opp).

Lets continue with updating thermal pressure, etc, even if we aren't
able to find an OPP here.

This fixes warning generated by the 'smatch' tool.

Fixes: 6240aaad75e1 ("cpufreq: qcom-hw: fix the opp entries refcounting")
Cc: v5.18+ <stable@vger.kernel.org> # v5.18+
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index d5ef3c66c762..bb32659820ce 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -316,14 +316,14 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
 	if (IS_ERR(opp)) {
 		dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
 	} else {
-		throttled_freq = freq_hz / HZ_PER_KHZ;
-
-		/* Update thermal pressure (the boost frequencies are accepted) */
-		arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
-
 		dev_pm_opp_put(opp);
 	}
 
+	throttled_freq = freq_hz / HZ_PER_KHZ;
+
+	/* Update thermal pressure (the boost frequencies are accepted) */
+	arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
+
 	/*
 	 * In the unlikely case policy is unregistered do not enable
 	 * polling or h/w interrupt
-- 
2.31.1.272.g89b43f80a514

Re: [PATCH] cpufreq: qcom-cpufreq-hw: Fix uninitialized throttled_freq warning

[Neil Armstrong]

On 21/09/2022 09:10, Viresh Kumar wrote:
> Commit 6240aaad75e1 was supposed to drop the reference count to the OPP,
> instead it avoided more stuff if the OPP isn't found. This isn't
> entirely correct. We already have a frequency value available, we just
> couldn't align it with an OPP in case of IS_ERR(opp).
> 
> Lets continue with updating thermal pressure, etc, even if we aren't
> able to find an OPP here.
> 
> This fixes warning generated by the 'smatch' tool.
> 
> Fixes: 6240aaad75e1 ("cpufreq: qcom-hw: fix the opp entries refcounting")
> Cc: v5.18+ <stable@vger.kernel.org> # v5.18+
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
> ---
>   drivers/cpufreq/qcom-cpufreq-hw.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
> index d5ef3c66c762..bb32659820ce 100644
> --- a/drivers/cpufreq/qcom-cpufreq-hw.c
> +++ b/drivers/cpufreq/qcom-cpufreq-hw.c
> @@ -316,14 +316,14 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
>   	if (IS_ERR(opp)) {
>   		dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
>   	} else {
> -		throttled_freq = freq_hz / HZ_PER_KHZ;
> -
> -		/* Update thermal pressure (the boost frequencies are accepted) */
> -		arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
> -
>   		dev_pm_opp_put(opp);
>   	}
>   
> +	throttled_freq = freq_hz / HZ_PER_KHZ;
> +
> +	/* Update thermal pressure (the boost frequencies are accepted) */
> +	arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
> +
>   	/*
>   	 * In the unlikely case policy is unregistered do not enable
>   	 * polling or h/w interrupt

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>